A highly uniquely-designed trench knife, these blades are worn like brass knuckles, but each one has a sharpened zigzag "tooth" over each knuckle, and a blade coming out of one end. The knives are made from a special metal that can be infused through "chakra flow" with elemental chakra or even Yin–Yang chakra to produce added effects.[1] According to Shikamaru, the blades are able to absorb the chakra type of the user, and become the origin of a technique, for the user.[2]